但ORACLE又提供了另外一种机制：
从redo日志或归档日志中恢复该数据，并且更加神奇，ORACLE甚至将其还原为一条条的sql语句！不得不佩服ORACLE的强大功能！
而且该方法还有一点是flashback功能所望尘莫及的：它甚至可以恢复drop掉的表，以及其中的全部语句。

方法如下：
SQL> select member from v$logfile;
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MEMBER
--------------------------------------------
/home/ora10g/oradata/orcl/redo03.log
/home/ora10g/oradata/orcl/redo02.log
/home/ora10g/oradata/orcl/redo01.log

SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE('/home/ora10g/oradata/orcl/redo01.log',DBMS_LOGMNR.NEW);
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PL/SQL procedure successfully completed.
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SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE('/home/ora10g/oradata/orcl/redo02.log',DBMS_LOGMNR.ADDFILE);
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PL/SQL procedure successfully completed.
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SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE('/home/ora10g/oradata/orcl/redo03.log',DBMS_LOGMNR.ADDFILE);
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PL/SQL procedure successfully completed.
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SQL> EXECUTE DBMS_LOGMNR.START_LOGMNR(options=>16);
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PL/SQL procedure successfully completed.
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SQL> select sql_redo from v$logmnr_contents where seg_name='TEST';
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SQL_REDO
--------------------------------------------
drop table test;
create table test(id integer,name varchar(20)); <----看到了吧^_^删除的表都可以再找回来。

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